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Background of Technological Development The true industrial application value of vacuum low-temperature automatic continuous dryers emerged in the 1970s. The first products produced using vacuum low-temperature automatic continuous dryers were maltose, manufactured by Scott and Balfour in the UK. In the mid-1950s, Wander and Sulzer collaborated to develop the first Swiss vacuum belt dryer unit. In the 1960s, Sulzer sold this vacuum low-temperature automatic continuous dryer to Zschokke in Dottingen, Switzerland. The original vacuum low-temperature automatic continuous dryer had a conveyor belt made of metal.
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